Photosynthesis of C3 and C4 Species in Response to Increased CO2 Concentration and Drought Stress  

Oleh:

Hamim

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Hayati Journal of Biosciences vol. 12 no. 4 (Dec. 2005), page 131-138.
Topik: photosynthesis; Increase CO2; Drought Stress; Photosynthesis
Fulltext: 55.pdf (245.05KB)

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Perpustakaan Pusat (Semanggi) Nomor Panggil: HH13.7 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Photosynthetic gas exchange in reponse to increased carbon dioxide concentration (CO2) and drought stress of two C3 (wheat and kale) and two C4 species (Echinochloa Crusgalliii and Amaranthus Caudatus) were analysed. Plants were grown in controlled growth chambers with ambient (350 umol mol-1) and doubled ambient (CO2). Drought was given by withholding water until the plants severely wilted, whereas the control plants were watered daily. Even tough stomatal conductance (Gs) of C4 species either under ambient or double (CO2) was lower than those in C3, doubled (CO2) decreased Gs of all species under well watered conditions. As a result, the plants grown under doubled (CO2) transpired less water than those grown under ambient (CO2). Photosynthesis (Pn) of the C4 species was sustained during moderate drought when those of the C3 species decreased significantly. Double (CO2) increased photosynthesis of C3 but not of C4 species. Increased (CO2) was only able to delay Pn reduction of all species due to the drought, but not remove it completely. The positive effects of increased (CO2) during moderate drought and the disapperance of it under severe drought sugessting that metabolic effect may limit photosynthesis under severe drought.

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